Auriculotherapy (AT) is a complementary therapy, based on the idea that the ear is a microsystem which reflects the entire body, represented on the auricle, the outer portion of the ear. Mapping of the auricle has been described, according to the fact that pathology of different organs can induce specific changes in the auricle, for example color change or sensitivity. Treating specific areas, which somehow would be "connected" to the affected organ could also improve the functioning of the body or relieve pain. AT uses placement of needles at points tailored to the patient's pathology. Whatever the mechanisms involved, the effectiveness of ATis currently supported by randomized controlled trials. It is validated by WHO since 1987, mapped in an international nomenclature initially proposed by Nogier.